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Fiat 500 Convertible vs Mercedes B Class comparison

Compare performance (118 HP vs 238 HP), boot space and price (19,700 £ vs 33,100 £ ) at a glance. Find out which car is the better choice for you – Fiat 500 Convertible or Mercedes B Class?

Fiat 500 Convertible vs Mercedes B Class: Key differences

Fiat 500 Convertible

  • clearly cheaper
  • noticeably lighter
details

Mercedes B Class

4.9 (6 Reviews)
rate
  • substantially more power
  • only slightly more efficient
  • visibly quicker 0–100 km/h
  • substantially more trunk space
details

All details on performance, efficiency, range and trunk space can be found in the technical comparison below – including user reviews for both models.

By Achim Sedelmaier

Here’s where it gets real: The technical differences in detail

500 Convertible

Costs and Efficiency:

Price and efficiency are often the first things buyers look at. Here it becomes clear which model has the long-term edge – whether at the pump, the plug, or in purchase price.

Fiat 500 Convertible is clearly cheaper – starting at 19,700 £ , while the Mercedes B Class costs 33,100 £ . That’s a price difference of around 13,424 £.

Fuel consumption also shows a difference: the Mercedes B Class uses 5.1 L/100km and is only slightly more efficient than the Fiat 500 Convertible with 5.2 L/100km. The difference is about 0.1 L/100km.

B Class

Engine and Performance:

Power, torque and acceleration are the classic benchmarks for car enthusiasts – and here, some clear differences start to show.

When it comes to engine power, the Mercedes B Class offers substantially more power – delivering 238 HP compared to 118 HP. That’s roughly 120 HP more horsepower.

When accelerating from 0 to 100 km/h, the Mercedes B Class is visibly quicker – completing the sprint in 6.5 s, while the Fiat 500 Convertible takes 9 s. That’s about 2.5 s quicker.

There’s also a difference in torque: the Mercedes B Class delivers significantly more torque with 400 Nm compared to 220 Nm. That’s about 180 Nm more.

Space and Everyday Use:

Whether family car or daily driver – which one offers more room, flexibility and comfort?

Seats: Mercedes B Class offers more seats – 5 vs 4.

In terms of curb weight, Fiat 500 Convertible is noticeably lighter – 1,150 kg compared to 1,405 kg. The difference is around 255 kg.

Looking at boot space, the Mercedes B Class offers substantially more boot space – 455 L compared to 183 L. That’s a difference of about 272 L.

When it comes to payload, the Mercedes B Class carries substantially more – 550 kg compared to 325 kg. That’s a difference of about 225 kg.

Who wins the race in the data check?

The Mercedes B Class is decisively ahead in the objective data comparison.
This result only shows which model scores more points on paper – not which of the two cars feels right for you.

from £33,100
B Class

Mercedes B Class

  • Engine Type Petrol MHEV, Diesel
  • Transmission Automatic
  • Drive Type Front-Wheel Drive, All-Wheel Drive
  • Power HP 116 - 238 HP
  • Consumption L/100km 5.1 - 6.9 L/100km
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Frequently compared as well

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Mercedes B Class
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Fiat 500 Convertible
Mercedes B Class

Costs and Consumption
View detailed analysis

Engine and Performance
View detailed analysis

Dimensions and Body
View detailed analysis

Fiat 500 Convertible

The Fiat 500 Convertible is a cheeky, retro-styled roof-down city car that turns heads and makes short trips feel like mini vacations. It’s more about charm and personality than practicality, ideal for style-conscious buyers who prefer fun and flair over brute practicality.

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Reviews Fiat 500 Convertible

No reviews yet. Share your experience and help others decide.

Mercedes B Class

The Mercedes B-Class is a smart, grown-up compact people carrier that dresses everyday practicality in a near‑premium polish, perfect for buyers who want comfort and a classy badge without the theatrics. It won’t set your pulse racing on a back road, but it will make school runs, commutes and grocery hauls feel pleasantly civilized — a reliable, slightly posh companion for real life.

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Reviews Mercedes B Class

4.9 (6 Reviews)
rate
SiBa
31 Jul 2026, 14:51:34

We've been driving only the B180D automatic for 9 years — there's nothing better. Great on long trips; the next one will be another B180D automatic.

How do you mainly use this car? (optional): Family car
Efficiency / Consumption & Range
Comfort & Interior
Driving Fun / Performance
Safety
Practicality / Trunk & Everyday Use
Value for Money
Peter
5 Mar 2026, 05:51:19

My wife and I have been driving a Mercedes W247 200d for seven years now, with 93,000 km on the clock. The car is very comfortable even on long trips and economical. At the last service the pads of the electric parking brake were replaced; otherwise no repairs. We love this car.

How do you mainly use this car? (optional): Family car
Efficiency / Consumption & Range
Comfort & Interior
Driving Fun / Performance
Technology & Infotainment
Safety
Practicality / Trunk & Everyday Use
Value for Money

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BMW 2 Series
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Fiat 500 Convertible
Mercedes B Class

Costs and Consumption
Price
19,700 - 28,300 £
Price
33,100 - 52,500 £
Consumption L/100km
5.2 - 5.3 L/100km
Consumption L/100km
5.1 - 6.9 L/100km
Consumption kWh/100km
13 - 14.9 kWh/100km
Consumption kWh/100km
-
Electric Range
190 - 313 km
Electric Range
-
Battery Capacity
-
Battery Capacity
-
co2
0 - 123 g/km
co2
133 - 156 g/km
Fuel tank capacity
-
Fuel tank capacity
-

Dimensions and Body
Body Type
Convertible
Body Type
MPV
Seats
4
Seats
5
Doors
-
Doors
-
Curb weight
1,150 - 1,480 kg
Curb weight
1,405 - 1,565 kg
Trunk capacity
183 L
Trunk capacity
445 - 455 L
Length
-
Length
-
Width
1,683 - 1,684 mm
Width
1,796 mm
Height
-
Height
-
Max trunk capacity
-
Max trunk capacity
-
Payload
250 - 325 kg
Payload
515 - 550 kg

Engine and Performance
Engine Type
Electric, Petrol MHEV
Engine Type
Petrol MHEV, Diesel
Transmission
Automatic, Manuel
Transmission
Automatic
Transmission Detail
Reduction Gearbox, Manual Gearbox
Transmission Detail
Dual-Clutch Automatic
Drive Type
Front-Wheel Drive
Drive Type
Front-Wheel Drive, All-Wheel Drive
Power HP
65 - 118 HP
Power HP
116 - 238 HP
Acceleration 0-100km/h
9 - 17.3 s
Acceleration 0-100km/h
6.5 - 10 s
Max Speed
-
Max Speed
-
Torque
92 - 220 Nm
Torque
200 - 400 Nm
Number of Cylinders
3
Number of Cylinders
4
Power kW
48 - 87 kW
Power kW
85 - 175 kW
Engine capacity
999 cm3
Engine capacity
1,332 - 1,991 cm3

General
Model Year
2,025 - 2,026
Model Year
2025
CO2 Efficiency Class
A, D
CO2 Efficiency Class
D, E, F
Brand
Fiat
Brand
Mercedes-Benz
What drive types are available for the Fiat 500 Convertible?

The Fiat 500 Convertible is available as Front-Wheel Drive.

DriveDuel uses data analysis and artificial intelligence to evaluate vehicle data and create content. Content is regularly reviewed and improved. The displayed prices are estimates based on German list prices, adjusted to the respective country’s VAT. Country-specific registration taxes are not included. This information is not legally binding.